Stress triggering of normal aftershocks due to strike slip earthquakes in compressive regime

Gahalaut, Kalpna ; Gahalaut, V. K. (2008) Stress triggering of normal aftershocks due to strike slip earthquakes in compressive regime Journal of Asian Earth Sciences, 33 (5-6). pp. 379-382. ISSN 1367-9120

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A few cases of occurrence of normal aftershocks after strike slip earthquakes in compressive regime have been reported in the literature. Occurrence of such aftershocks is intriguing as they occurred despite the apparent stabilizing influence of compressive plate tectonic stresses on the normal faults. To investigate the occurrence processes of such earthquakes, we calculate change in static stress on optimally oriented normal and reverse faults in the dilational and compressional step over zones, respectively, due to slip on a vertical strike slip fault under compressive regime. We find that change in static stress is much more pronounced on normal faults as compared to that on reverse faults, for all values of fault friction. Change in static stress on reverse fault is marginally positive only when the fault friction is low, whereas for normal faults it is positive for all values of fault friction, and is maximum for high fault friction. We suggest that strike slip faulting in compressive regime creates a localized tensile environment in the dilational step over zone, which causes normal faulting in that region. The aftershocks on such normal faults are considered to have occurred as an almost instantaneous response of stress transfer due to strike slip motion.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Earthquake Triggering; Coulomb Stress; Koyna Earthquake; Tangshan Earthquake
ID Code:113272
Deposited On:07 Jun 2018 09:16
Last Modified:07 Jun 2018 09:16

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